Dear Janet, Robin,
The point I was making to the person who was asking about unbendable was this, namely rather than get caught in a debate about acquiring said unbendable arm, just check out certain areas eg protecting the head, rolling like a ball , watching out for shoulders /collar bones etc.I agree that any injury is counter productive and can lead to complications eg surgery , latent arthritis, pain.Sorry if I misled you with my guidelines.No need for anybody to endorse any view I express on this forum.I am not running for President of the U.S.A just tossing in a few comments which you may or may not agree with.Cannot please everybody even part of the time. Hope you are well,Joe,

Couldn't agree more. There are far more important things, and safety is paramount.